Contour not shown correctly in 3D Tri-Surf Plots

When plotting the 3D tri-surf figure, if we don't specify the facecolor of the plot, the contour will work well.
However, if we specify the faceolor of each faces, the contour will be stuck in the middle can't move and the coordinate
of each vertex also doesn't show its correct x,y,z.
The examples in the tutorials also have this problem.
Not sure if there have other way to specifiy the facecolor without making these issues.
Thank you very much for your help!

fig <- plot_ly(type = 'mesh3d',
  x = c(0, 1, 2, 0),
  y = c(0, 0, 1, 2),
  z = c(0, 2, 0, 1),
  i = c(0, 0, 0, 1),
  j = c(1, 2, 3, 2),
  k = c(2, 3, 1, 3),
  opacity = 0.5,
  contour = list(show = TRUE, color="#000", width=15)
  #facecolor = toRGB(viridisLite::viridis(4))
)
fig

fig <- plot_ly(type = 'mesh3d',
  x = c(0, 1, 2, 0),
  y = c(0, 0, 1, 2),
  z = c(0, 2, 0, 1),
  i = c(0, 0, 0, 1),
  j = c(1, 2, 3, 2),
  k = c(2, 3, 1, 3),
  opacity = 0.5,
  contour = list(show = TRUE, color="#000", width=15),
  facecolor = toRGB(viridisLite::viridis(4))
)
fig

まず、issue に提供されている 2 つの R plot_ly mesh3d の例を実行し、facecolor の有無による輪郭の移動と頂点座標を比較します。3D tri-surf のレンダリングパスを追跡して違いを特定し、facecolor によって輪郭の位置や座標が誤ることがなくなった時点で issue は完了とします。